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discovery.go
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discovery.go
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package etcd
import (
"context"
"encoding/json"
"errors"
"log"
"net"
"sync"
"github.com/why444216978/gin-api/library/registry"
"github.com/why444216978/go-util/validate"
"go.etcd.io/etcd/api/v3/mvccpb"
clientv3 "go.etcd.io/etcd/client/v3"
)
//EtcdDiscovery 服务发现
type EtcdDiscovery struct {
config *registry.DiscoveryConfig
cli *clientv3.Client
nodeList map[string]*registry.ServiceNode //node list
lock sync.RWMutex
decode registry.Decode
}
var _ registry.Discovery = (*EtcdDiscovery)(nil)
type DiscoverOption func(*EtcdDiscovery)
func WithDiscoverConfig(config *registry.DiscoveryConfig) DiscoverOption {
if err := validate.ValidateCamel(config); err != nil {
panic(err)
}
return func(ed *EtcdDiscovery) { ed.config = config }
}
func WithDiscoverClient(cli *clientv3.Client) DiscoverOption {
return func(er *EtcdDiscovery) { er.cli = cli }
}
// NewDiscovery
func NewDiscovery(opts ...DiscoverOption) (*EtcdDiscovery, error) {
ed := &EtcdDiscovery{
nodeList: make(map[string]*registry.ServiceNode),
decode: JSONDecode,
}
for _, o := range opts {
o(ed)
}
return ed, nil
}
// WatchService
func (s *EtcdDiscovery) WatchService(ctx context.Context) error {
if s.config.Type == registry.TypeHostPort {
s.SetServiceList(s.config.ServiceName, ®istry.ServiceNode{
Host: s.config.Host,
Port: s.config.Port,
})
return nil
}
if s.config.Type == registry.TypeHostDomain {
host, err := net.ResolveIPAddr("ip", "localhost")
if err != nil {
panic(err)
}
s.SetServiceList(s.config.ServiceName, ®istry.ServiceNode{
Host: host.IP.String(),
Port: 80,
})
return nil
}
if s.cli == nil {
return errors.New("cli is nil")
}
//根据前缀获取现有的key
resp, err := s.cli.Get(ctx, s.config.ServiceName, clientv3.WithPrefix())
if err != nil {
return err
}
for _, kv := range resp.Kvs {
key := string(kv.Key)
val := string(kv.Value)
node, err := s.decode(val)
if err != nil {
log.Println("service:", s.config.ServiceName, " put key:", key, "val:", val, "err:", err.Error())
continue
}
s.SetServiceList(key, node)
}
//监视前缀,修改变更的服务节点
go s.watcher(ctx)
return nil
}
// watcher
func (s *EtcdDiscovery) watcher(ctx context.Context) {
rch := s.cli.Watch(ctx, s.config.ServiceName, clientv3.WithPrefix())
log.Printf("watching prefix:%s now...", s.config.ServiceName)
for wresp := range rch {
for _, ev := range wresp.Events {
key := string(ev.Kv.Key)
val := string(ev.Kv.Value)
switch ev.Type {
case mvccpb.PUT:
node, err := s.decode(val)
if err != nil {
log.Println("service:", s.config.ServiceName, " put key:", key, "val:", val, "err:", err.Error())
return
}
s.SetServiceList(key, node)
log.Println("service", s.config.ServiceName, " put key:", key, "val:", val)
case mvccpb.DELETE:
s.DelServiceList(key)
log.Println("service:", s.config.ServiceName, " del key:", key)
}
}
}
}
// SetServiceList
func (s *EtcdDiscovery) SetServiceList(key string, node *registry.ServiceNode) {
s.lock.Lock()
defer s.lock.Unlock()
s.nodeList[key] = node
}
// DelServiceList
func (s *EtcdDiscovery) DelServiceList(key string) {
s.lock.Lock()
defer s.lock.Unlock()
delete(s.nodeList, key)
}
// GetServices
func (s *EtcdDiscovery) GetServices() []*registry.ServiceNode {
s.lock.RLock()
defer s.lock.RUnlock()
nodes := make([]*registry.ServiceNode, 0)
for _, node := range s.nodeList {
nodes = append(nodes, node)
}
return nodes
}
// GetLoadBalance
func (s *EtcdDiscovery) GetLoadBalance() string {
return s.config.LoadBalance
}
// Close
func (s *EtcdDiscovery) Close() error {
if s.cli == nil {
return nil
}
return s.cli.Close()
}
func JSONDecode(val string) (*registry.ServiceNode, error) {
node := ®istry.ServiceNode{}
err := json.Unmarshal([]byte(val), node)
if err != nil {
return nil, errors.New("Unmarshal val " + err.Error())
}
return node, nil
}